GB2296039A - Stress reduction at a high pressure fluid passage junction - Google Patents

Stress reduction at a high pressure fluid passage junction Download PDF

Info

Publication number
GB2296039A
GB2296039A GB9425414A GB9425414A GB2296039A GB 2296039 A GB2296039 A GB 2296039A GB 9425414 A GB9425414 A GB 9425414A GB 9425414 A GB9425414 A GB 9425414A GB 2296039 A GB2296039 A GB 2296039A
Authority
GB
United Kingdom
Prior art keywords
outlet
junction
depression
fluid flow
stress
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9425414A
Other versions
GB9425414D0 (en
Inventor
Paul John Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Perkins Ltd
Original Assignee
Perkins Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Perkins Ltd filed Critical Perkins Ltd
Priority to GB9425414A priority Critical patent/GB2296039A/en
Publication of GB9425414D0 publication Critical patent/GB9425414D0/en
Priority to DE69523266T priority patent/DE69523266T2/en
Priority to EP95309086A priority patent/EP0717227B1/en
Priority to US08/571,715 priority patent/US5819808A/en
Priority to JP7329091A priority patent/JPH08232802A/en
Publication of GB2296039A publication Critical patent/GB2296039A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L41/00—Branching pipes; Joining pipes to walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008—Arrangement of fuel passages inside of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/14—Making holes
    • B23H9/16—Making holes using an electrolytic jet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations

Description

1 2296039 A METHOD FOR REDUCING STRESS AT A JUNCTION OF HIGH PRESSURE
FLUID FLOW PASSAGES IN A BODY AND A JUNCTION FORMED THEREBY The present invention relates to a method for
reducing stress at a junction of high pressure fluid flow passages in a body and a junction formed thereby. This invention has a particular application in the field of internal combustion engine fuel injectors.
Where high pressure fluid flow passages intersect to form a junction in a body, stress is concentrated locally at the junction due to hoop stress. This can lead to cracking of the material of the body at the junction. The material of the body at the junction is particularly susceptible to cracking or some other failure of this nature if the junction comprises a primary fluid flow passageway and a secondary fluid flow passageway having an outlet connecting therewith at an acute angle to said primary fluid flow passage.
One known method of reducing the hoop stress concentrated at such a junction is to form an annular groove extending around the primary fluid f low passage at the position of the outlet. Whilst this helps direct hoop stress away from the material of the body adjacent the outlet, experience has shown that it is only partially successful in doing SO.
2 It is also helpful to increase the angle of intersection of the secondary fluid flow passage with respect to said primary fluid f low passage to be as close as possible to 900. However, design constraints for positioning the intersecting passages in the body may make this impracticable.
A further known method of reducing hoop stress concentrated at such a junction comprises electrochemically machining a pocket into an inner wall immediately surrounding the outlet of the secondary fluid flow passage. This gives a wider land at the outlet thereby reducing the concentration of stress. However, stress carried by the wall of the primary fluid flow passage is still channelled towards the high stress area that surrounds the outlet at the junction thus undermining the effect of this known method.
it is an object of the present invention to provide a method of reducing stress at a junction of high pressure fluid flow passages in a body and a junction formed by said method.
According to a first aspect of the present invention, there is provided a method of reducing stress at a junction of high pressure fluid flow passages in a body, said method comprising the step of forming a depression in an inner wall of a primary fluid flow passage at a junction of said 3 primary fluid flow passage with an outlet of a secondary fluid flow passage connected therewith, wherein said depression is formed to surround and is spaced from said outlet. 5 Preferably, the method includes spacing the depression outwardly surrounding said outlet by a distance sufficient to direct stress to portions of the body more able to withstand it. Preferably, the method includes forming said depression to completely surround said outlet.
Preferably also, the method includes spacing portions of the depression outwardly from the outlet by distances determined from stress analysis calculations relating to the diameters of the passages.
Preferably further, the depression is generally circular in plan.
According to a second aspect of the invention there is provided a junction of high pressure fluid flow passages in a body comprising a primary fluid flow passage and a secondary fluid flow passage having an outlet connected therewith, wherein an inner wall of the primary fluid flow passage is formed with a depression surrounding and spaced from said outlet.
Preferably, the depression is spaced outwardly surrounding said outlet by a distance sufficient to 4 direct stress to portions of the body more able to withstand it.
Preferably, the depression is formed to completely surround the outlet.
Preferably also, the depression is generally circular in plan.
The foregoing and further features of the present invention will be more readily understood from the following description of a preferred embodiment, by way of example thereof, with reference to the accompanying drawings, of which:
Figure 1 is a sectional side view of a portion of a body illustrating a junction of high pressure fluid flow passages of simple form; is Figure 2 is a similar view to figure 1 but illustrating a first known method for reducing stress at the junction; Figure 3 is also a similar view to f igure 1 but illustrating a second known method for reducing stress at the junction; Figure 4 is an end-on sectional view of figure 3 illustrating the hoop stress pattern at the junction; Figure 5 is a side sectional view of a portion of a body illustrating a junction formed in accordance with the present invention; Figure 6 is an end-on sectional view along line A-A of figure 5; Figure 7 is a view from the inside of the primary fluid flow passage illustrating the junction 5 formed in accordance with the invention; and Figure 8 is a view on an enlarged scale of a portion of figure 6 illustrating the isostatic pressure distribution within the primary fluid flow passage at the junction and the resulting hoop stress pattern in the wall of said passage surrounding said junction.
Figure 1 illustrates a conventional junction between high pressure fluid flow passages in a body 10 comprising a primary fluid flow passage 12 intersected at an acute angle by a secondary fluid flow passageway 14 whose outlet 16 communicates with said primary fluid flow passage 12. The figure illustrates the isostatic pressure distribution P existing within the passages (12, 14) which results in a concentration of hoop stress in the material of the body 10 around the outlet 16 of the secondary fluid flow passage 14. The hoop stress is particularly concentrated at a side (B) of the outlet 16 which forms an acute angle with the primary fluid flow passage 12. In some instances, the material of the body 10 at the junction may crack or suffer some other similar form of failure, 6 for example, a fracturing of the wall possibly resulting in a part of the wall breaking clear and passing into the fluid flowing in said passages (12, 14).
Figure 2 illustrates a first known method of reducing the stress concentration at the junction. This comprises forming an annular groove 18 extending around an inner wall 20 of the primary fluid flow passage 12 at the position of the outlet 16. The annular groove 18 may be formed by any suitable means including electrochemical machining, for example. Experience has shown that this solution has limited success since hoop stresses due to the isostatic pressure P of the fluid in the passages (12, 14) still concentrate around the outlet 16.
Figure 3 illustrates a second known method of reducing stress at the junction by electrochemically machining a pocket 22 in the inner wall 20 of the primary fluid flow passage 12 at the position of the outlet 16. Whilst this does alleviate hoop stress concentration around the outlet 16, it does not do so sufficiently to direct the stress towards other areas of the body 10 distant from the outlet 16. In figure 4, it can be seen that the hoop stress pattern C due to the isostatic pressure P of the fluid in the passages (12, 14) still concentrates in 7 the material of the body around the outlet 16 and thus failure of material at the outlet 16 remains a distinct possibility.
The method of the illustrated by f igures 5 to 8 used to denote like parts.
figures that the method essentially comprises forming a depression 24 in the inner wall 20 of the primary fluid flow passage 12 surrounding but spaced from the outlet 16 of the secondary fluid flow passage 14 which communicates with the primary fluid flow passage 12. It has surprisingly been found that not only does the formation of the depression 24 surrounding but at a distance from the outlet 16 direct hoop stress away from said outlet 16 but that the isostatic pressure P of the fluid in the passages (12, 14) places the material of the body 10 immediately adjacent the outlet 16 into compression.
The depression 24 can be formed by electrochemical machining or any other suitable method.
In a preferred embodiment as shown in figures 5 to 8, the depression 24 completely surrounds the outlet 16 and is of a circular form such that all portions of the depression 24 are equally distant from the outlet 16 of the secondary fluid flow passage 14. However, it will be appreciated that present invention is Like numerals are It can be seen from the 9 8 stress analysis techniques allow calculations to be made to determine the desired dimensions of the depression 24 including distances of portions of it from the outlet 16. It will also be appreciated that the depression 24 may be spaced outwardly from the outlet 16 by a variable distance according to factors such as the diameters of the passages, the angle of the secondary fluid flow passage makes with the primary fluid flow passage 14 and the material of the body 10.
Figure 8 particularly well illustrates the method of the invention. It can be seen from figure 8 that the isostatic pressure distribution P of the fluid in the passages (12, 14) creates a hoop stress pattern C in the material of the body 10 at the outlet 16 which directs stress, or at least reduces its concentration, from the portions (loa,b) immediately adjacent the outlet 16. Thus, the possibility of failure of the material of the body 10 at these critical portions of the junction is substantially reduced.
t 9

Claims (1)

1. A method of reducing stress at of high pressure fluid flow passages in a method comprising the step of forming a in an inner wall of a primary f luid f low passage at junction of said primary passage with an outlet of secondary f luid flow passage connected therewith, wherein said depression is formed to generally surround and be spaced from said outlet.
2. A method as claimed in claim 1, wherein it includes spacing the depression outwardly surrounding said outlet by a distance sufficient to direct stress to portions of the body more able to withstand it.
3 a junction body, said depression is A method as claimed in claim 1 or claim 2, wherein it includes spacing portions of the depression outwardly from the outlet by distances determined from stress analysis calculations relating to the diameters of the passages.
4. A method as claimed in any preceding claim, wherein it includes forming said depression to completely surround said outlet.
A method as claimed in any of claims 1, 2 and 4, wherein it includes forming the depression to be generally circular (ring-shaped) in plan.
a 0 6. A method as claimed in any one of claims 1 to 4, wherein it includes forming said depression by electrochemical machining.
7. A junction of high pressure fluid flow passages in a body comprising a primary fluid flow passage and a secondary fluid flow passage intersecting said primary passage and having an outlet connected therewith, wherein an inner wall of the primary passage has formed therein a depression surrounding and spaced from said outlet.
8. A junction as claimed in claim 7, wherein the depression is spaced outwardly surrounding said outlet by a distance sufficient to direct stress to portions of the body more able to withstand it.
9. A junction as claimed in claim 7 or claim 8, wherein the depression completely surrounds the outlet.
10. A junction as claimed in any one of claims 7 to 9, wherein the depression is generally circular (ring-shaped) in plan.
11. A fuel injector for an internal combustion engine including a junction in accordance with any one of claims 7 to 10.
12. A method substantially as hereinbefore described with reference to figures 4 to 8 of the drawings.
13. A method substantially as hereinbefore described with reference to figure 9 of the drawings.
14. A junction substantially as hereinbefore described with reference to figures 4 to 8 of the drawings.
15. A junction substantially as hereinbefore described with reference to figure 9 of the drawings.
16. A fuel injector substantially as hereinbefore described with reference to figures 4 to 8 of the drawings.
17. A fuel injector substantially as hereinbefore described with reference to figure 9 of the drawings.
a r a
GB9425414A 1994-12-16 1994-12-16 Stress reduction at a high pressure fluid passage junction Withdrawn GB2296039A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB9425414A GB2296039A (en) 1994-12-16 1994-12-16 Stress reduction at a high pressure fluid passage junction
DE69523266T DE69523266T2 (en) 1994-12-16 1995-12-13 Method of reducing stress in branches in a high pressure flow channel system, and branch formed thereby
EP95309086A EP0717227B1 (en) 1994-12-16 1995-12-13 A method for reducing stress at a junction of high pressure fluid flow passages in a body, and a junction formed thereby
US08/571,715 US5819808A (en) 1994-12-16 1995-12-13 Method for reducing stress at a junction of high pressure fluid flow passages in a body and a junction formed thereby
JP7329091A JPH08232802A (en) 1994-12-16 1995-12-18 Relaxing method of stress in connecting section of high-pressure fluid flow path and connecting section formed by said method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9425414A GB2296039A (en) 1994-12-16 1994-12-16 Stress reduction at a high pressure fluid passage junction

Publications (2)

Publication Number Publication Date
GB9425414D0 GB9425414D0 (en) 1995-02-15
GB2296039A true GB2296039A (en) 1996-06-19

Family

ID=10766051

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9425414A Withdrawn GB2296039A (en) 1994-12-16 1994-12-16 Stress reduction at a high pressure fluid passage junction

Country Status (5)

Country Link
US (1) US5819808A (en)
EP (1) EP0717227B1 (en)
JP (1) JPH08232802A (en)
DE (1) DE69523266T2 (en)
GB (1) GB2296039A (en)

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Publication number Priority date Publication date Assignee Title
FR2760265A1 (en) * 1997-03-03 1998-09-04 Usui Kokusai Sangyo Kk METHOD FOR IMPROVING FATIGUE RESISTANCE DUE TO REPEATED PRESSURES IN A BYPASS FOR HIGH-PRESSURE FLUID, DERIVATIVE CONDUIT OBTAINED AND ELEMENT WITH ADJUSTED SLIDING RING
GB2322922A (en) * 1997-03-03 1998-09-09 Usui Kokusai Sangyo Kk Common rail branch fitting
GB2322920A (en) * 1997-03-03 1998-09-09 Usui Kokusai Sangyo Kk Common rail branch fitting
GB2322921A (en) * 1997-03-03 1998-09-09 Usui Kokusai Sangyo Kk Common rail branch fitting
GB2335015A (en) * 1998-03-02 1999-09-08 Usui Kokusai Sangyo Kk Common rail block branch fitting
EP0999361A2 (en) * 1998-11-06 2000-05-10 Siemens Aktiengesellschaft Device with junction of drilled holes
DE19808542C2 (en) * 1997-03-04 2001-11-29 Usui Kokusai Sangyo Kk Distributor

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JPH10160079A (en) * 1996-10-03 1998-06-16 Usui Internatl Ind Co Ltd Common rail
JP3525883B2 (en) * 1999-12-28 2004-05-10 株式会社デンソー Fuel injection pump
JP4189714B2 (en) * 2000-08-03 2008-12-03 株式会社デンソー Fuel injection device
DE10152230A1 (en) * 2001-10-20 2003-04-30 Bosch Gmbh Robert High pressure resistant injector body
DE10214404A1 (en) * 2002-03-30 2003-10-09 Bosch Gmbh Robert Component, in particular housing a high pressure fuel pump, and method for its preparation
DE10234909A1 (en) * 2002-07-31 2004-02-19 Robert Bosch Gmbh Fuel injector for self-ignition internal combustion engine has inflow boring sector running through connection region of connector
GB0602742D0 (en) 2005-06-06 2006-03-22 Delphi Tech Inc Machining method
DE602006005169D1 (en) 2006-11-27 2009-03-26 Delphi Tech Inc Housing with intersecting passages
JP4502046B2 (en) * 2007-11-28 2010-07-14 株式会社デンソー Processing method of fluid equipment
DE102008035356A1 (en) 2008-07-29 2010-02-04 Robert Bosch Gmbh valve housing
EP2320084B1 (en) * 2009-11-06 2012-09-12 Delphi Technologies Holding S.à.r.l. Housing with intersecting passages for high pressure fluid applications
DE102010028046A1 (en) * 2010-04-21 2011-10-27 Robert Bosch Gmbh high pressure pump
EP2392816B1 (en) 2010-06-03 2013-10-09 Delphi Technologies Holding S.à.r.l. Stress Relief in Pressurized Fluid Flow System
DE102010030586A1 (en) 2010-06-28 2011-12-29 Robert Bosch Gmbh Metallic component for high pressure applications
DE102011075054A1 (en) * 2011-05-02 2012-11-08 Robert Bosch Gmbh fuel distributor
DE102011101770A1 (en) * 2011-05-17 2012-08-02 L'orange Gmbh Assembly has solid body and intersection of high-pressure fluid channel with another high-pressure fluid channel is formed in solid body
DE102013226606A1 (en) * 2013-12-19 2015-07-09 Volkswagen Aktiengesellschaft Fluid distributor with a pressure accumulator
DE102014212194A1 (en) 2014-06-25 2015-12-31 Robert Bosch Gmbh Method for reducing the voltage at an intersection of two merging channels
GB201516152D0 (en) * 2015-09-11 2015-10-28 Delphi Int Operations Lux Srl Fuel pump housing
US10533420B2 (en) 2016-11-15 2020-01-14 Pratt & Whitney Canada Corp. Stress reduction dimples for circular holes
JP6800813B2 (en) 2017-06-21 2020-12-16 三菱重工航空エンジン株式会社 Stress reduction structure, gas turbine casing and gas turbine

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GB809044A (en) * 1955-09-19 1959-02-18 Licencia Talalmanyokat Improvements in or relating to fuel injectors for diesel engines
US4168804A (en) * 1977-03-16 1979-09-25 Robert Bosch Gmbh Fuel injection nozzle for internal combustion engines
EP0361359A1 (en) * 1988-09-27 1990-04-04 FIAT AUTO S.p.A. A multi-nozzle injector for an internal combustion engine
EP0449662A1 (en) * 1990-03-29 1991-10-02 Cummins Engine Company, Inc. A fuel injector and a method of relieving stress concentration within a fuel injector bore
EP0520659A1 (en) * 1991-06-25 1992-12-30 Oy Wärtsilä Diesel International Ltd. Improved fuel injection valve arrangement and engine using such an arrangement

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2322921B (en) * 1997-03-03 2001-09-12 Usui Kokusai Sangyo Kk Common rail and method of manufacturing the same
AU739702B2 (en) * 1997-03-03 2001-10-18 Usui Kokusai Sangyo Kabushiki Kaisha Common rail and method of manufacturing the same
GB2322920A (en) * 1997-03-03 1998-09-09 Usui Kokusai Sangyo Kk Common rail branch fitting
GB2322921A (en) * 1997-03-03 1998-09-09 Usui Kokusai Sangyo Kk Common rail branch fitting
GB2322922B (en) * 1997-03-03 2002-03-06 Usui Kokusai Sangyo Kk Common rail and method of manufacturing the same
GB2322920B (en) * 1997-03-03 2002-02-27 Usui Kokusi Sangyo Kaisha Ltd Common rail and method of manufacturing the same
GB2322922A (en) * 1997-03-03 1998-09-09 Usui Kokusai Sangyo Kk Common rail branch fitting
FR2760265A1 (en) * 1997-03-03 1998-09-04 Usui Kokusai Sangyo Kk METHOD FOR IMPROVING FATIGUE RESISTANCE DUE TO REPEATED PRESSURES IN A BYPASS FOR HIGH-PRESSURE FLUID, DERIVATIVE CONDUIT OBTAINED AND ELEMENT WITH ADJUSTED SLIDING RING
DE19808894C2 (en) * 1997-03-03 2001-11-29 Usui Kokusai Sangyo Kk A method of increasing the fatigue strength due to repeated pressure at a branch hole in a high pressure liquid component, a branch hole part of a high pressure liquid component produced by the method, and a high pressure liquid component with a built-in slider having the branch hole
AU739405B2 (en) * 1997-03-03 2001-10-11 Usui Kokusai Sangyo Kabushiki Kaisha Common rail and method of manufacturing the same
DE19808542C2 (en) * 1997-03-04 2001-11-29 Usui Kokusai Sangyo Kk Distributor
GB2335015A (en) * 1998-03-02 1999-09-08 Usui Kokusai Sangyo Kk Common rail block branch fitting
EP0999361A2 (en) * 1998-11-06 2000-05-10 Siemens Aktiengesellschaft Device with junction of drilled holes
EP0999361A3 (en) * 1998-11-06 2003-12-10 Siemens Aktiengesellschaft Device with junction of drilled holes

Also Published As

Publication number Publication date
EP0717227A2 (en) 1996-06-19
DE69523266T2 (en) 2002-06-27
EP0717227B1 (en) 2001-10-17
US5819808A (en) 1998-10-13
JPH08232802A (en) 1996-09-10
EP0717227A3 (en) 1997-05-02
DE69523266D1 (en) 2001-11-22
GB9425414D0 (en) 1995-02-15

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